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Nguyen, Thu; Kocovski, Nikolce; Macdonald, Sean; Yeang, Han Xian Aw; Wang, Minyu; Neeson, Paul J
Methods in molecular biology (Clifton, N.J.), 2021, Letnik: 2265Journal Article
Tumor-infiltrating lymphocytes (TILs) are an important prognostic indicator in melanoma and play a key role in the patient's response to immune checkpoint blockade. However, until recently, it was not possible to combine multi-parameter markers to define the TILs and their histological context. Multiplex immunohistochemistry (mIHC) is a new technology which addresses this issue and enables simultaneous detection of melanoma and multiple immune subsets in formalin fixed paraffin embedded tissue. Following antigen retrieval, melanoma tissue sections are stained by OPAL on an autostainer, including serial rounds of epitope labelling with monoclonal antibodies followed by tyramide signal amplification (TSA). The stained tissue sections are then imaged on the Vectra instrument, and digital images are processed by analysis software (inForm and HALO) to derive tissue segmentation and immune subset densities within the tumor and tumor stroma. Spatial relationships between immune cells and tumor cells are then analyzed using a novel R algorithm. Taken together, multiplex IHC describes the histological context of the immune system in melanoma. The data is objective and allows for characterization of individual melanomas as T cell inflamed (hot), immune excluded, or no immune cells (cold).
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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